Acoustic Guitar, Bass, Drums, Piano, Synth – Ali PayamiBacking Vocals – Max MartinEdited By [Vocals] – Peter Karlsson*Engineer – Sam HollandEngineer [Assistant] – Cory Bice, Jeremy LertolaEngineer [For Mix] – John HanesMixed By – Serban GheneaPercussion, Producer, Programmed By – Ali Payami, Max MartinVocals – Katy PerryWritten-By – Ali Payami, Katy Perry, Max Martin, Savan Kotecha

Backing Vocals – Astrid S, Katy PerryBass, Piano, Synth – Ali PayamiEdited By [Vocals] – Peter Karlsson*Engineer – Sam HollandEngineer [Assistant] – Cory Bice, Jeremy LertolaEngineer [For Mix] – John HanesMixed By – Serban GheneaPercussion, Producer, Programmed By – Ali Payami, Max MartinPerformer [Max's Tooth] – Max MartinVocals – Katy PerryWritten-By – Ali Payami, Katy Perry, Max Martin, Sarah Hudson, Sia Furler

Backing Vocals – Katy Perry, Shellback Bass, Drums, Keyboards, Percussion, Producer, Programmed By, Synth – Ali Payami, Max Martin, Shellback Edited By [Vocals] – Peter Karlsson*Engineer – Sam HollandEngineer [Assistant] – Cory Bice, Jeremy LertolaEngineer [For Mix] – John HanesMixed By – Serban GheneaVocals – Katy PerryWritten-By – Ali Payami, Ferras Alqaisi, Katy Perry, Max Martin, Shellback

Drums, Producer, Programmed By, Synth – Duke DumontEngineer – Noah "Mailbox" Passovoy*, Rachael FindlenEngineer [Additional] – Aubry "Big Juice" Delaine*Engineer [Assistant] – Zeke MishanecEngineer [For Mix] – John HanesEngineer [Nicki Minaj Vocals, Assistant Engineered] – Iain FindlayFeaturing – Nicki MinajKeyboards – PJ "Promnite" Sledge*Keyboards [Additional], Producer [Vocals], Programmed By [Additional] – Noah "Mailbox" Passovoy*Mixed By – Serban GheneaProducer [Additional] – Noah "Mailbox" Passovoy*, PJ "Promnite" Sledge*Recorded By [Nicki Minaj Vocals] – Aubry "Big Juice" Delaine*Vocals – Katy PerryWritten-By – Brittany Hazzard, Duke Dumont, Katy Perry, Onika Maraj, PJ "Promnite" Sledge*, Sarah Hudson

Backing Vocals, Bass, Guitar, Producer – Hayden JamesEngineer – Noah "Mailbox" Passovoy*, Rachael FindlenEngineer [For Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Noah "Mailbox" Passovoy*Synth – Hayden James, Thomas StellVocals – Katy PerryWritten-By – Ferras Alqaisi, Hayden James, Katy Perry, Thomas Stell

Engineer – Noah "Mailbox" Passovoy*, Rachael FindlenEngineer [For Mix] – John HanesInstruments, Producer – Jack GarrattMixed By – Serban GheneaProducer [Vocals] – Noah "Mailbox" Passovoy*Vocals – Katy PerryWritten-By – Jack Garratt, Katy Perry, William Robinson*

Edited By [Vocals] – Noah "Mailbox" Passovoy*Engineer – Noah "Mailbox" Passovoy*, Rachael FindlenEngineer [For Mix] – John HanesMixed By – Serban GheneaProducer – Corin RoddickProducer [Vocals] – Corin Roddick, Rachael FindlenVocals – Katy PerryWritten-By – Corin Roddick, Katy Perry, Megan James, Sarah Hudson

Acoustic Guitar – Max MartinBacking Vocals, Bass, Drums, Electric Guitar, Keyboards, Percussion, Piano, Programmed By – Ali PayamiEngineer – Rachael FindlenEngineer [For Mix] – John HanesMixed By – Serban GheneaProducer – Ali Payami, Corin RoddickProducer [Vocals, Additional] – Ali Payami, Peter Karlsson*Producer [Vocals] – Corin Roddick, Max Martin, Rachael FindlenVocals – Katy PerryWritten-By – Corin Roddick, Katy Perry, Megan James, Sarah Hudson

Backing Vocals – Katy Perry, Max Martin, Sia, Skip MarleyBass, Drums, Handclaps [Epic Claps], Piano, Synth – Ali PayamiEdited By [Vocals] – Peter Karlsson*Engineer – Sam HollandEngineer [Assistant] – Cory Bice, Jeremy LertolaEngineer [For Mix] – John HanesFeaturing – Skip MarleyGuitar [Funky Guitar] – James Alan GhalebMastered By – Tom CoyneMixed By – Serban GheneaPercussion – Ali Payami, Peter Karlsson*Producer, Programmed By – Ali Payami, Max MartinSynthesizer [Prophet 6 & Solina] – Max MartinVocals – Katy PerryWritten-By – Ali Payami, Katy Perry, Max Martin, Sia Furler, Skip Marley

Bass – Joshua MoreauEngineer – Noah "Mailbox" Passovoy*, Rachael Findlen, Stephen "The Sauce" Hybicki*Engineer [For Mix] – John HanesGuitar – Casey HooperKeyboards, Percussion, Producer [Additional], Producer [Vocals], Programmed By [Additional] – Noah "Mailbox" Passovoy*Mixed By – Serban GheneaProducer – Mike WiLL Made-It*, ScoolyVocals – Katy PerryWritten-By – Katy Perry, Marcus Bell , Mia Moretti, Michael Williams , Sarah Hudson

Backing Vocals – Shellback Edited By [Vocals] – Peter Karlsson*Engineer – Rachael FindlenEngineer [Assistant] – Cory Bice, Jeremy LertolaEngineer [For Mix] – John HanesFeaturing – MigosKeyboards, Programmed By – Oscar Holter, Shellback Mixed By – Serban GheneaProducer – Max Martin, Oscar Holter, Shellback Recorded By [Migos Vocals] – Daryl "DJ Durel" McPhersonVocals – Katy PerryWritten-By – Ferras Alqaisi, Katy Perry, Kiari Cephus, Kirsnick Ball, Max Martin, Oscar Holter, Quavious Marshall, Shellback

Edited By [Vocals] – Noah "Mailbox" Passovoy*, Oscar HolterEngineer – Noah "Mailbox" Passovoy*, Rachael FindlenEngineer [For Mix] – John HanesKeyboards, Programmed By – Oscar HolterMixed By – Serban GheneaProducer – Corin Roddick, Oscar HolterProducer [Vocals] – Corin Roddick, Rachael FindlenVocals – Katy PerryWritten-By – Corin Roddick, Katy Perry, Megan James, Sarah Hudson

Bass, Drums, Piano, Producer, Programmed By, Synthesizer – Elof LoelvEdited By [Vocals] – Peter Karlsson*Engineer – Elof Loelv, Rachael FindlenEngineer [For Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Max MartinVocals – Katy PerryWritten-By – Dijon McFarlane, Elof Loelv, Katy Perry, Lewis Hughes, Nicholas Audino*, Noonie Bao

Bass – Pino PalladinoChoir [Gospel Studio Choir] – Alexandra Brown*, Anthony Evans, Aretha Scruggs, Brandon Winbush, Briana Lee, Carmel Echols, Carmen Carter, Carmen Twillie, Charlean Carmon, Clydene Jackson, David Loucks, Denise Carite, Edie Lehmann Boddicker, Eyvonne Williams*, Jamie McCrary, Jason Woods , Jim Gilstrap, Louis Price, Luke Edgemon, Monique Donnelly, Nelson Beato, Oren Waters, Toni Scruggs, Will WheatonContractor [Vocal Contracting], Conductor [Gospel Choir Conducting] – Edie Lehmann BoddickerDrum Programming [Additional], Producer [Additional] – IllangeloDrum Programming, Keyboards, Producer – Jeff BhaskerEngineer – Noah "Mailbox" Passovoy*, Rachael Findlen, Ryan NasciEngineer [For Mix] – John HanesMixed By – Serban GheneaProducer [Vocals] – Noah "Mailbox" Passovoy*Vocals – Katy PerryWritten-By – Jeff Bhasker, Katy Perry, Sarah Hudson

Arranged By [Instruments], Instruments, Producer – Dustin O'HalloranDrum Programming [Additional] – Rob SimonsenEngineer – Francesco Donadello, Rachael FindlenEngineer [For Mix] – John HanesMixed By – Serban GheneaVocals – Katy PerryWritten-By – Alexis Taylor, Ferras Alqaisi, Joe Goddard, Katy Perry